1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * 7 * This file is part of the SCTP kernel implementation 8 * 9 * This file contains sctp stream maniuplation primitives and helpers. 10 * 11 * This SCTP implementation is free software; 12 * you can redistribute it and/or modify it under the terms of 13 * the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * This SCTP implementation is distributed in the hope that it 18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 19 * ************************ 20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 21 * See the GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with GNU CC; see the file COPYING. If not, see 25 * <http://www.gnu.org/licenses/>. 26 * 27 * Please send any bug reports or fixes you make to the 28 * email address(es): 29 * lksctp developers <linux-sctp@vger.kernel.org> 30 * 31 * Written or modified by: 32 * Xin Long <lucien.xin@gmail.com> 33 */ 34 35 #include <linux/list.h> 36 #include <net/sctp/sctp.h> 37 #include <net/sctp/sm.h> 38 #include <net/sctp/stream_sched.h> 39 40 /* Migrates chunks from stream queues to new stream queues if needed, 41 * but not across associations. Also, removes those chunks to streams 42 * higher than the new max. 43 */ 44 static void sctp_stream_outq_migrate(struct sctp_stream *stream, 45 struct sctp_stream *new, __u16 outcnt) 46 { 47 struct sctp_association *asoc; 48 struct sctp_chunk *ch, *temp; 49 struct sctp_outq *outq; 50 int i; 51 52 asoc = container_of(stream, struct sctp_association, stream); 53 outq = &asoc->outqueue; 54 55 list_for_each_entry_safe(ch, temp, &outq->out_chunk_list, list) { 56 __u16 sid = sctp_chunk_stream_no(ch); 57 58 if (sid < outcnt) 59 continue; 60 61 sctp_sched_dequeue_common(outq, ch); 62 /* No need to call dequeue_done here because 63 * the chunks are not scheduled by now. 64 */ 65 66 /* Mark as failed send. */ 67 sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM); 68 if (asoc->peer.prsctp_capable && 69 SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags)) 70 asoc->sent_cnt_removable--; 71 72 sctp_chunk_free(ch); 73 } 74 75 if (new) { 76 /* Here we actually move the old ext stuff into the new 77 * buffer, because we want to keep it. Then 78 * sctp_stream_update will swap ->out pointers. 79 */ 80 for (i = 0; i < outcnt; i++) { 81 kfree(new->out[i].ext); 82 new->out[i].ext = stream->out[i].ext; 83 stream->out[i].ext = NULL; 84 } 85 } 86 87 for (i = outcnt; i < stream->outcnt; i++) 88 kfree(stream->out[i].ext); 89 } 90 91 static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt, 92 gfp_t gfp) 93 { 94 struct sctp_stream_out *out; 95 96 out = kmalloc_array(outcnt, sizeof(*out), gfp); 97 if (!out) 98 return -ENOMEM; 99 100 if (stream->out) { 101 memcpy(out, stream->out, min(outcnt, stream->outcnt) * 102 sizeof(*out)); 103 kfree(stream->out); 104 } 105 106 if (outcnt > stream->outcnt) 107 memset(out + stream->outcnt, 0, 108 (outcnt - stream->outcnt) * sizeof(*out)); 109 110 stream->out = out; 111 112 return 0; 113 } 114 115 static int sctp_stream_alloc_in(struct sctp_stream *stream, __u16 incnt, 116 gfp_t gfp) 117 { 118 struct sctp_stream_in *in; 119 120 in = kmalloc_array(incnt, sizeof(*stream->in), gfp); 121 122 if (!in) 123 return -ENOMEM; 124 125 if (stream->in) { 126 memcpy(in, stream->in, min(incnt, stream->incnt) * 127 sizeof(*in)); 128 kfree(stream->in); 129 } 130 131 if (incnt > stream->incnt) 132 memset(in + stream->incnt, 0, 133 (incnt - stream->incnt) * sizeof(*in)); 134 135 stream->in = in; 136 137 return 0; 138 } 139 140 int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt, 141 gfp_t gfp) 142 { 143 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); 144 int i, ret = 0; 145 146 gfp |= __GFP_NOWARN; 147 148 /* Initial stream->out size may be very big, so free it and alloc 149 * a new one with new outcnt to save memory if needed. 150 */ 151 if (outcnt == stream->outcnt) 152 goto in; 153 154 /* Filter out chunks queued on streams that won't exist anymore */ 155 sched->unsched_all(stream); 156 sctp_stream_outq_migrate(stream, NULL, outcnt); 157 sched->sched_all(stream); 158 159 ret = sctp_stream_alloc_out(stream, outcnt, gfp); 160 if (ret) 161 goto out; 162 163 stream->outcnt = outcnt; 164 for (i = 0; i < stream->outcnt; i++) 165 stream->out[i].state = SCTP_STREAM_OPEN; 166 167 sched->init(stream); 168 169 in: 170 sctp_stream_interleave_init(stream); 171 if (!incnt) 172 goto out; 173 174 ret = sctp_stream_alloc_in(stream, incnt, gfp); 175 if (ret) { 176 sched->free(stream); 177 kfree(stream->out); 178 stream->out = NULL; 179 stream->outcnt = 0; 180 goto out; 181 } 182 183 stream->incnt = incnt; 184 185 out: 186 return ret; 187 } 188 189 int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid) 190 { 191 struct sctp_stream_out_ext *soute; 192 193 soute = kzalloc(sizeof(*soute), GFP_KERNEL); 194 if (!soute) 195 return -ENOMEM; 196 stream->out[sid].ext = soute; 197 198 return sctp_sched_init_sid(stream, sid, GFP_KERNEL); 199 } 200 201 void sctp_stream_free(struct sctp_stream *stream) 202 { 203 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); 204 int i; 205 206 sched->free(stream); 207 for (i = 0; i < stream->outcnt; i++) 208 kfree(stream->out[i].ext); 209 kfree(stream->out); 210 kfree(stream->in); 211 } 212 213 void sctp_stream_clear(struct sctp_stream *stream) 214 { 215 int i; 216 217 for (i = 0; i < stream->outcnt; i++) { 218 stream->out[i].mid = 0; 219 stream->out[i].mid_uo = 0; 220 } 221 222 for (i = 0; i < stream->incnt; i++) 223 stream->in[i].mid = 0; 224 } 225 226 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new) 227 { 228 struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream); 229 230 sched->unsched_all(stream); 231 sctp_stream_outq_migrate(stream, new, new->outcnt); 232 sctp_stream_free(stream); 233 234 stream->out = new->out; 235 stream->in = new->in; 236 stream->outcnt = new->outcnt; 237 stream->incnt = new->incnt; 238 239 sched->sched_all(stream); 240 241 new->out = NULL; 242 new->in = NULL; 243 new->outcnt = 0; 244 new->incnt = 0; 245 } 246 247 static int sctp_send_reconf(struct sctp_association *asoc, 248 struct sctp_chunk *chunk) 249 { 250 struct net *net = sock_net(asoc->base.sk); 251 int retval = 0; 252 253 retval = sctp_primitive_RECONF(net, asoc, chunk); 254 if (retval) 255 sctp_chunk_free(chunk); 256 257 return retval; 258 } 259 260 static bool sctp_stream_outq_is_empty(struct sctp_stream *stream, 261 __u16 str_nums, __be16 *str_list) 262 { 263 struct sctp_association *asoc; 264 __u16 i; 265 266 asoc = container_of(stream, struct sctp_association, stream); 267 if (!asoc->outqueue.out_qlen) 268 return true; 269 270 if (!str_nums) 271 return false; 272 273 for (i = 0; i < str_nums; i++) { 274 __u16 sid = ntohs(str_list[i]); 275 276 if (stream->out[sid].ext && 277 !list_empty(&stream->out[sid].ext->outq)) 278 return false; 279 } 280 281 return true; 282 } 283 284 int sctp_send_reset_streams(struct sctp_association *asoc, 285 struct sctp_reset_streams *params) 286 { 287 struct sctp_stream *stream = &asoc->stream; 288 __u16 i, str_nums, *str_list; 289 struct sctp_chunk *chunk; 290 int retval = -EINVAL; 291 __be16 *nstr_list; 292 bool out, in; 293 294 if (!asoc->peer.reconf_capable || 295 !(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) { 296 retval = -ENOPROTOOPT; 297 goto out; 298 } 299 300 if (asoc->strreset_outstanding) { 301 retval = -EINPROGRESS; 302 goto out; 303 } 304 305 out = params->srs_flags & SCTP_STREAM_RESET_OUTGOING; 306 in = params->srs_flags & SCTP_STREAM_RESET_INCOMING; 307 if (!out && !in) 308 goto out; 309 310 str_nums = params->srs_number_streams; 311 str_list = params->srs_stream_list; 312 if (str_nums) { 313 int param_len = 0; 314 315 if (out) { 316 for (i = 0; i < str_nums; i++) 317 if (str_list[i] >= stream->outcnt) 318 goto out; 319 320 param_len = str_nums * sizeof(__u16) + 321 sizeof(struct sctp_strreset_outreq); 322 } 323 324 if (in) { 325 for (i = 0; i < str_nums; i++) 326 if (str_list[i] >= stream->incnt) 327 goto out; 328 329 param_len += str_nums * sizeof(__u16) + 330 sizeof(struct sctp_strreset_inreq); 331 } 332 333 if (param_len > SCTP_MAX_CHUNK_LEN - 334 sizeof(struct sctp_reconf_chunk)) 335 goto out; 336 } 337 338 nstr_list = kcalloc(str_nums, sizeof(__be16), GFP_KERNEL); 339 if (!nstr_list) { 340 retval = -ENOMEM; 341 goto out; 342 } 343 344 for (i = 0; i < str_nums; i++) 345 nstr_list[i] = htons(str_list[i]); 346 347 if (out && !sctp_stream_outq_is_empty(stream, str_nums, nstr_list)) { 348 retval = -EAGAIN; 349 goto out; 350 } 351 352 chunk = sctp_make_strreset_req(asoc, str_nums, nstr_list, out, in); 353 354 kfree(nstr_list); 355 356 if (!chunk) { 357 retval = -ENOMEM; 358 goto out; 359 } 360 361 if (out) { 362 if (str_nums) 363 for (i = 0; i < str_nums; i++) 364 stream->out[str_list[i]].state = 365 SCTP_STREAM_CLOSED; 366 else 367 for (i = 0; i < stream->outcnt; i++) 368 stream->out[i].state = SCTP_STREAM_CLOSED; 369 } 370 371 asoc->strreset_chunk = chunk; 372 sctp_chunk_hold(asoc->strreset_chunk); 373 374 retval = sctp_send_reconf(asoc, chunk); 375 if (retval) { 376 sctp_chunk_put(asoc->strreset_chunk); 377 asoc->strreset_chunk = NULL; 378 if (!out) 379 goto out; 380 381 if (str_nums) 382 for (i = 0; i < str_nums; i++) 383 stream->out[str_list[i]].state = 384 SCTP_STREAM_OPEN; 385 else 386 for (i = 0; i < stream->outcnt; i++) 387 stream->out[i].state = SCTP_STREAM_OPEN; 388 389 goto out; 390 } 391 392 asoc->strreset_outstanding = out + in; 393 394 out: 395 return retval; 396 } 397 398 int sctp_send_reset_assoc(struct sctp_association *asoc) 399 { 400 struct sctp_stream *stream = &asoc->stream; 401 struct sctp_chunk *chunk = NULL; 402 int retval; 403 __u16 i; 404 405 if (!asoc->peer.reconf_capable || 406 !(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) 407 return -ENOPROTOOPT; 408 409 if (asoc->strreset_outstanding) 410 return -EINPROGRESS; 411 412 if (!sctp_outq_is_empty(&asoc->outqueue)) 413 return -EAGAIN; 414 415 chunk = sctp_make_strreset_tsnreq(asoc); 416 if (!chunk) 417 return -ENOMEM; 418 419 /* Block further xmit of data until this request is completed */ 420 for (i = 0; i < stream->outcnt; i++) 421 stream->out[i].state = SCTP_STREAM_CLOSED; 422 423 asoc->strreset_chunk = chunk; 424 sctp_chunk_hold(asoc->strreset_chunk); 425 426 retval = sctp_send_reconf(asoc, chunk); 427 if (retval) { 428 sctp_chunk_put(asoc->strreset_chunk); 429 asoc->strreset_chunk = NULL; 430 431 for (i = 0; i < stream->outcnt; i++) 432 stream->out[i].state = SCTP_STREAM_OPEN; 433 434 return retval; 435 } 436 437 asoc->strreset_outstanding = 1; 438 439 return 0; 440 } 441 442 int sctp_send_add_streams(struct sctp_association *asoc, 443 struct sctp_add_streams *params) 444 { 445 struct sctp_stream *stream = &asoc->stream; 446 struct sctp_chunk *chunk = NULL; 447 int retval; 448 __u32 outcnt, incnt; 449 __u16 out, in; 450 451 if (!asoc->peer.reconf_capable || 452 !(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 453 retval = -ENOPROTOOPT; 454 goto out; 455 } 456 457 if (asoc->strreset_outstanding) { 458 retval = -EINPROGRESS; 459 goto out; 460 } 461 462 out = params->sas_outstrms; 463 in = params->sas_instrms; 464 outcnt = stream->outcnt + out; 465 incnt = stream->incnt + in; 466 if (outcnt > SCTP_MAX_STREAM || incnt > SCTP_MAX_STREAM || 467 (!out && !in)) { 468 retval = -EINVAL; 469 goto out; 470 } 471 472 if (out) { 473 retval = sctp_stream_alloc_out(stream, outcnt, GFP_KERNEL); 474 if (retval) 475 goto out; 476 } 477 478 chunk = sctp_make_strreset_addstrm(asoc, out, in); 479 if (!chunk) { 480 retval = -ENOMEM; 481 goto out; 482 } 483 484 asoc->strreset_chunk = chunk; 485 sctp_chunk_hold(asoc->strreset_chunk); 486 487 retval = sctp_send_reconf(asoc, chunk); 488 if (retval) { 489 sctp_chunk_put(asoc->strreset_chunk); 490 asoc->strreset_chunk = NULL; 491 goto out; 492 } 493 494 stream->incnt = incnt; 495 stream->outcnt = outcnt; 496 497 asoc->strreset_outstanding = !!out + !!in; 498 499 out: 500 return retval; 501 } 502 503 static struct sctp_paramhdr *sctp_chunk_lookup_strreset_param( 504 struct sctp_association *asoc, __be32 resp_seq, 505 __be16 type) 506 { 507 struct sctp_chunk *chunk = asoc->strreset_chunk; 508 struct sctp_reconf_chunk *hdr; 509 union sctp_params param; 510 511 if (!chunk) 512 return NULL; 513 514 hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr; 515 sctp_walk_params(param, hdr, params) { 516 /* sctp_strreset_tsnreq is actually the basic structure 517 * of all stream reconf params, so it's safe to use it 518 * to access request_seq. 519 */ 520 struct sctp_strreset_tsnreq *req = param.v; 521 522 if ((!resp_seq || req->request_seq == resp_seq) && 523 (!type || type == req->param_hdr.type)) 524 return param.v; 525 } 526 527 return NULL; 528 } 529 530 static void sctp_update_strreset_result(struct sctp_association *asoc, 531 __u32 result) 532 { 533 asoc->strreset_result[1] = asoc->strreset_result[0]; 534 asoc->strreset_result[0] = result; 535 } 536 537 struct sctp_chunk *sctp_process_strreset_outreq( 538 struct sctp_association *asoc, 539 union sctp_params param, 540 struct sctp_ulpevent **evp) 541 { 542 struct sctp_strreset_outreq *outreq = param.v; 543 struct sctp_stream *stream = &asoc->stream; 544 __u32 result = SCTP_STRRESET_DENIED; 545 __u16 i, nums, flags = 0; 546 __be16 *str_p = NULL; 547 __u32 request_seq; 548 549 request_seq = ntohl(outreq->request_seq); 550 551 if (ntohl(outreq->send_reset_at_tsn) > 552 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map)) { 553 result = SCTP_STRRESET_IN_PROGRESS; 554 goto err; 555 } 556 557 if (TSN_lt(asoc->strreset_inseq, request_seq) || 558 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 559 result = SCTP_STRRESET_ERR_BAD_SEQNO; 560 goto err; 561 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 562 i = asoc->strreset_inseq - request_seq - 1; 563 result = asoc->strreset_result[i]; 564 goto err; 565 } 566 asoc->strreset_inseq++; 567 568 /* Check strreset_enable after inseq inc, as sender cannot tell 569 * the peer doesn't enable strreset after receiving response with 570 * result denied, as well as to keep consistent with bsd. 571 */ 572 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) 573 goto out; 574 575 if (asoc->strreset_chunk) { 576 if (!sctp_chunk_lookup_strreset_param( 577 asoc, outreq->response_seq, 578 SCTP_PARAM_RESET_IN_REQUEST)) { 579 /* same process with outstanding isn't 0 */ 580 result = SCTP_STRRESET_ERR_IN_PROGRESS; 581 goto out; 582 } 583 584 asoc->strreset_outstanding--; 585 asoc->strreset_outseq++; 586 587 if (!asoc->strreset_outstanding) { 588 struct sctp_transport *t; 589 590 t = asoc->strreset_chunk->transport; 591 if (del_timer(&t->reconf_timer)) 592 sctp_transport_put(t); 593 594 sctp_chunk_put(asoc->strreset_chunk); 595 asoc->strreset_chunk = NULL; 596 } 597 598 flags = SCTP_STREAM_RESET_INCOMING_SSN; 599 } 600 601 nums = (ntohs(param.p->length) - sizeof(*outreq)) / sizeof(__u16); 602 if (nums) { 603 str_p = outreq->list_of_streams; 604 for (i = 0; i < nums; i++) { 605 if (ntohs(str_p[i]) >= stream->incnt) { 606 result = SCTP_STRRESET_ERR_WRONG_SSN; 607 goto out; 608 } 609 } 610 611 for (i = 0; i < nums; i++) 612 stream->in[ntohs(str_p[i])].mid = 0; 613 } else { 614 for (i = 0; i < stream->incnt; i++) 615 stream->in[i].mid = 0; 616 } 617 618 result = SCTP_STRRESET_PERFORMED; 619 620 *evp = sctp_ulpevent_make_stream_reset_event(asoc, 621 flags | SCTP_STREAM_RESET_OUTGOING_SSN, nums, str_p, 622 GFP_ATOMIC); 623 624 out: 625 sctp_update_strreset_result(asoc, result); 626 err: 627 return sctp_make_strreset_resp(asoc, result, request_seq); 628 } 629 630 struct sctp_chunk *sctp_process_strreset_inreq( 631 struct sctp_association *asoc, 632 union sctp_params param, 633 struct sctp_ulpevent **evp) 634 { 635 struct sctp_strreset_inreq *inreq = param.v; 636 struct sctp_stream *stream = &asoc->stream; 637 __u32 result = SCTP_STRRESET_DENIED; 638 struct sctp_chunk *chunk = NULL; 639 __u32 request_seq; 640 __u16 i, nums; 641 __be16 *str_p; 642 643 request_seq = ntohl(inreq->request_seq); 644 if (TSN_lt(asoc->strreset_inseq, request_seq) || 645 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 646 result = SCTP_STRRESET_ERR_BAD_SEQNO; 647 goto err; 648 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 649 i = asoc->strreset_inseq - request_seq - 1; 650 result = asoc->strreset_result[i]; 651 if (result == SCTP_STRRESET_PERFORMED) 652 return NULL; 653 goto err; 654 } 655 asoc->strreset_inseq++; 656 657 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_STREAM_REQ)) 658 goto out; 659 660 if (asoc->strreset_outstanding) { 661 result = SCTP_STRRESET_ERR_IN_PROGRESS; 662 goto out; 663 } 664 665 nums = (ntohs(param.p->length) - sizeof(*inreq)) / sizeof(__u16); 666 str_p = inreq->list_of_streams; 667 for (i = 0; i < nums; i++) { 668 if (ntohs(str_p[i]) >= stream->outcnt) { 669 result = SCTP_STRRESET_ERR_WRONG_SSN; 670 goto out; 671 } 672 } 673 674 if (!sctp_stream_outq_is_empty(stream, nums, str_p)) { 675 result = SCTP_STRRESET_IN_PROGRESS; 676 asoc->strreset_inseq--; 677 goto err; 678 } 679 680 chunk = sctp_make_strreset_req(asoc, nums, str_p, 1, 0); 681 if (!chunk) 682 goto out; 683 684 if (nums) 685 for (i = 0; i < nums; i++) 686 stream->out[ntohs(str_p[i])].state = 687 SCTP_STREAM_CLOSED; 688 else 689 for (i = 0; i < stream->outcnt; i++) 690 stream->out[i].state = SCTP_STREAM_CLOSED; 691 692 asoc->strreset_chunk = chunk; 693 asoc->strreset_outstanding = 1; 694 sctp_chunk_hold(asoc->strreset_chunk); 695 696 result = SCTP_STRRESET_PERFORMED; 697 698 *evp = sctp_ulpevent_make_stream_reset_event(asoc, 699 SCTP_STREAM_RESET_INCOMING_SSN, nums, str_p, GFP_ATOMIC); 700 701 out: 702 sctp_update_strreset_result(asoc, result); 703 err: 704 if (!chunk) 705 chunk = sctp_make_strreset_resp(asoc, result, request_seq); 706 707 return chunk; 708 } 709 710 struct sctp_chunk *sctp_process_strreset_tsnreq( 711 struct sctp_association *asoc, 712 union sctp_params param, 713 struct sctp_ulpevent **evp) 714 { 715 __u32 init_tsn = 0, next_tsn = 0, max_tsn_seen; 716 struct sctp_strreset_tsnreq *tsnreq = param.v; 717 struct sctp_stream *stream = &asoc->stream; 718 __u32 result = SCTP_STRRESET_DENIED; 719 __u32 request_seq; 720 __u16 i; 721 722 request_seq = ntohl(tsnreq->request_seq); 723 if (TSN_lt(asoc->strreset_inseq, request_seq) || 724 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 725 result = SCTP_STRRESET_ERR_BAD_SEQNO; 726 goto err; 727 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 728 i = asoc->strreset_inseq - request_seq - 1; 729 result = asoc->strreset_result[i]; 730 if (result == SCTP_STRRESET_PERFORMED) { 731 next_tsn = asoc->ctsn_ack_point + 1; 732 init_tsn = 733 sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + 1; 734 } 735 goto err; 736 } 737 738 if (!sctp_outq_is_empty(&asoc->outqueue)) { 739 result = SCTP_STRRESET_IN_PROGRESS; 740 goto err; 741 } 742 743 asoc->strreset_inseq++; 744 745 if (!(asoc->strreset_enable & SCTP_ENABLE_RESET_ASSOC_REQ)) 746 goto out; 747 748 if (asoc->strreset_outstanding) { 749 result = SCTP_STRRESET_ERR_IN_PROGRESS; 750 goto out; 751 } 752 753 /* G4: The same processing as though a FWD-TSN chunk (as defined in 754 * [RFC3758]) with all streams affected and a new cumulative TSN 755 * ACK of the Receiver's Next TSN minus 1 were received MUST be 756 * performed. 757 */ 758 max_tsn_seen = sctp_tsnmap_get_max_tsn_seen(&asoc->peer.tsn_map); 759 asoc->stream.si->report_ftsn(&asoc->ulpq, max_tsn_seen); 760 761 /* G1: Compute an appropriate value for the Receiver's Next TSN -- the 762 * TSN that the peer should use to send the next DATA chunk. The 763 * value SHOULD be the smallest TSN not acknowledged by the 764 * receiver of the request plus 2^31. 765 */ 766 init_tsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map) + (1 << 31); 767 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL, 768 init_tsn, GFP_ATOMIC); 769 770 /* G3: The same processing as though a SACK chunk with no gap report 771 * and a cumulative TSN ACK of the Sender's Next TSN minus 1 were 772 * received MUST be performed. 773 */ 774 sctp_outq_free(&asoc->outqueue); 775 776 /* G2: Compute an appropriate value for the local endpoint's next TSN, 777 * i.e., the next TSN assigned by the receiver of the SSN/TSN reset 778 * chunk. The value SHOULD be the highest TSN sent by the receiver 779 * of the request plus 1. 780 */ 781 next_tsn = asoc->next_tsn; 782 asoc->ctsn_ack_point = next_tsn - 1; 783 asoc->adv_peer_ack_point = asoc->ctsn_ack_point; 784 785 /* G5: The next expected and outgoing SSNs MUST be reset to 0 for all 786 * incoming and outgoing streams. 787 */ 788 for (i = 0; i < stream->outcnt; i++) { 789 stream->out[i].mid = 0; 790 stream->out[i].mid_uo = 0; 791 } 792 for (i = 0; i < stream->incnt; i++) 793 stream->in[i].mid = 0; 794 795 result = SCTP_STRRESET_PERFORMED; 796 797 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, 0, init_tsn, 798 next_tsn, GFP_ATOMIC); 799 800 out: 801 sctp_update_strreset_result(asoc, result); 802 err: 803 return sctp_make_strreset_tsnresp(asoc, result, request_seq, 804 next_tsn, init_tsn); 805 } 806 807 struct sctp_chunk *sctp_process_strreset_addstrm_out( 808 struct sctp_association *asoc, 809 union sctp_params param, 810 struct sctp_ulpevent **evp) 811 { 812 struct sctp_strreset_addstrm *addstrm = param.v; 813 struct sctp_stream *stream = &asoc->stream; 814 __u32 result = SCTP_STRRESET_DENIED; 815 __u32 request_seq, incnt; 816 __u16 in, i; 817 818 request_seq = ntohl(addstrm->request_seq); 819 if (TSN_lt(asoc->strreset_inseq, request_seq) || 820 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 821 result = SCTP_STRRESET_ERR_BAD_SEQNO; 822 goto err; 823 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 824 i = asoc->strreset_inseq - request_seq - 1; 825 result = asoc->strreset_result[i]; 826 goto err; 827 } 828 asoc->strreset_inseq++; 829 830 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) 831 goto out; 832 833 if (asoc->strreset_chunk) { 834 if (!sctp_chunk_lookup_strreset_param( 835 asoc, 0, SCTP_PARAM_RESET_ADD_IN_STREAMS)) { 836 /* same process with outstanding isn't 0 */ 837 result = SCTP_STRRESET_ERR_IN_PROGRESS; 838 goto out; 839 } 840 841 asoc->strreset_outstanding--; 842 asoc->strreset_outseq++; 843 844 if (!asoc->strreset_outstanding) { 845 struct sctp_transport *t; 846 847 t = asoc->strreset_chunk->transport; 848 if (del_timer(&t->reconf_timer)) 849 sctp_transport_put(t); 850 851 sctp_chunk_put(asoc->strreset_chunk); 852 asoc->strreset_chunk = NULL; 853 } 854 } 855 856 in = ntohs(addstrm->number_of_streams); 857 incnt = stream->incnt + in; 858 if (!in || incnt > SCTP_MAX_STREAM) 859 goto out; 860 861 if (sctp_stream_alloc_in(stream, incnt, GFP_ATOMIC)) 862 goto out; 863 864 stream->incnt = incnt; 865 866 result = SCTP_STRRESET_PERFORMED; 867 868 *evp = sctp_ulpevent_make_stream_change_event(asoc, 869 0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC); 870 871 out: 872 sctp_update_strreset_result(asoc, result); 873 err: 874 return sctp_make_strreset_resp(asoc, result, request_seq); 875 } 876 877 struct sctp_chunk *sctp_process_strreset_addstrm_in( 878 struct sctp_association *asoc, 879 union sctp_params param, 880 struct sctp_ulpevent **evp) 881 { 882 struct sctp_strreset_addstrm *addstrm = param.v; 883 struct sctp_stream *stream = &asoc->stream; 884 __u32 result = SCTP_STRRESET_DENIED; 885 struct sctp_chunk *chunk = NULL; 886 __u32 request_seq, outcnt; 887 __u16 out, i; 888 int ret; 889 890 request_seq = ntohl(addstrm->request_seq); 891 if (TSN_lt(asoc->strreset_inseq, request_seq) || 892 TSN_lt(request_seq, asoc->strreset_inseq - 2)) { 893 result = SCTP_STRRESET_ERR_BAD_SEQNO; 894 goto err; 895 } else if (TSN_lt(request_seq, asoc->strreset_inseq)) { 896 i = asoc->strreset_inseq - request_seq - 1; 897 result = asoc->strreset_result[i]; 898 if (result == SCTP_STRRESET_PERFORMED) 899 return NULL; 900 goto err; 901 } 902 asoc->strreset_inseq++; 903 904 if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ)) 905 goto out; 906 907 if (asoc->strreset_outstanding) { 908 result = SCTP_STRRESET_ERR_IN_PROGRESS; 909 goto out; 910 } 911 912 out = ntohs(addstrm->number_of_streams); 913 outcnt = stream->outcnt + out; 914 if (!out || outcnt > SCTP_MAX_STREAM) 915 goto out; 916 917 ret = sctp_stream_alloc_out(stream, outcnt, GFP_ATOMIC); 918 if (ret) 919 goto out; 920 921 chunk = sctp_make_strreset_addstrm(asoc, out, 0); 922 if (!chunk) 923 goto out; 924 925 asoc->strreset_chunk = chunk; 926 asoc->strreset_outstanding = 1; 927 sctp_chunk_hold(asoc->strreset_chunk); 928 929 stream->outcnt = outcnt; 930 931 result = SCTP_STRRESET_PERFORMED; 932 933 *evp = sctp_ulpevent_make_stream_change_event(asoc, 934 0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC); 935 936 out: 937 sctp_update_strreset_result(asoc, result); 938 err: 939 if (!chunk) 940 chunk = sctp_make_strreset_resp(asoc, result, request_seq); 941 942 return chunk; 943 } 944 945 struct sctp_chunk *sctp_process_strreset_resp( 946 struct sctp_association *asoc, 947 union sctp_params param, 948 struct sctp_ulpevent **evp) 949 { 950 struct sctp_stream *stream = &asoc->stream; 951 struct sctp_strreset_resp *resp = param.v; 952 struct sctp_transport *t; 953 __u16 i, nums, flags = 0; 954 struct sctp_paramhdr *req; 955 __u32 result; 956 957 req = sctp_chunk_lookup_strreset_param(asoc, resp->response_seq, 0); 958 if (!req) 959 return NULL; 960 961 result = ntohl(resp->result); 962 if (result != SCTP_STRRESET_PERFORMED) { 963 /* if in progress, do nothing but retransmit */ 964 if (result == SCTP_STRRESET_IN_PROGRESS) 965 return NULL; 966 else if (result == SCTP_STRRESET_DENIED) 967 flags = SCTP_STREAM_RESET_DENIED; 968 else 969 flags = SCTP_STREAM_RESET_FAILED; 970 } 971 972 if (req->type == SCTP_PARAM_RESET_OUT_REQUEST) { 973 struct sctp_strreset_outreq *outreq; 974 __be16 *str_p; 975 976 outreq = (struct sctp_strreset_outreq *)req; 977 str_p = outreq->list_of_streams; 978 nums = (ntohs(outreq->param_hdr.length) - sizeof(*outreq)) / 979 sizeof(__u16); 980 981 if (result == SCTP_STRRESET_PERFORMED) { 982 if (nums) { 983 for (i = 0; i < nums; i++) { 984 stream->out[ntohs(str_p[i])].mid = 0; 985 stream->out[ntohs(str_p[i])].mid_uo = 0; 986 } 987 } else { 988 for (i = 0; i < stream->outcnt; i++) { 989 stream->out[i].mid = 0; 990 stream->out[i].mid_uo = 0; 991 } 992 } 993 994 flags = SCTP_STREAM_RESET_OUTGOING_SSN; 995 } 996 997 for (i = 0; i < stream->outcnt; i++) 998 stream->out[i].state = SCTP_STREAM_OPEN; 999 1000 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags, 1001 nums, str_p, GFP_ATOMIC); 1002 } else if (req->type == SCTP_PARAM_RESET_IN_REQUEST) { 1003 struct sctp_strreset_inreq *inreq; 1004 __be16 *str_p; 1005 1006 /* if the result is performed, it's impossible for inreq */ 1007 if (result == SCTP_STRRESET_PERFORMED) 1008 return NULL; 1009 1010 inreq = (struct sctp_strreset_inreq *)req; 1011 str_p = inreq->list_of_streams; 1012 nums = (ntohs(inreq->param_hdr.length) - sizeof(*inreq)) / 1013 sizeof(__u16); 1014 1015 *evp = sctp_ulpevent_make_stream_reset_event(asoc, flags, 1016 nums, str_p, GFP_ATOMIC); 1017 } else if (req->type == SCTP_PARAM_RESET_TSN_REQUEST) { 1018 struct sctp_strreset_resptsn *resptsn; 1019 __u32 stsn, rtsn; 1020 1021 /* check for resptsn, as sctp_verify_reconf didn't do it*/ 1022 if (ntohs(param.p->length) != sizeof(*resptsn)) 1023 return NULL; 1024 1025 resptsn = (struct sctp_strreset_resptsn *)resp; 1026 stsn = ntohl(resptsn->senders_next_tsn); 1027 rtsn = ntohl(resptsn->receivers_next_tsn); 1028 1029 if (result == SCTP_STRRESET_PERFORMED) { 1030 __u32 mtsn = sctp_tsnmap_get_max_tsn_seen( 1031 &asoc->peer.tsn_map); 1032 LIST_HEAD(temp); 1033 1034 asoc->stream.si->report_ftsn(&asoc->ulpq, mtsn); 1035 1036 sctp_tsnmap_init(&asoc->peer.tsn_map, 1037 SCTP_TSN_MAP_INITIAL, 1038 stsn, GFP_ATOMIC); 1039 1040 /* Clean up sacked and abandoned queues only. As the 1041 * out_chunk_list may not be empty, splice it to temp, 1042 * then get it back after sctp_outq_free is done. 1043 */ 1044 list_splice_init(&asoc->outqueue.out_chunk_list, &temp); 1045 sctp_outq_free(&asoc->outqueue); 1046 list_splice_init(&temp, &asoc->outqueue.out_chunk_list); 1047 1048 asoc->next_tsn = rtsn; 1049 asoc->ctsn_ack_point = asoc->next_tsn - 1; 1050 asoc->adv_peer_ack_point = asoc->ctsn_ack_point; 1051 1052 for (i = 0; i < stream->outcnt; i++) { 1053 stream->out[i].mid = 0; 1054 stream->out[i].mid_uo = 0; 1055 } 1056 for (i = 0; i < stream->incnt; i++) 1057 stream->in[i].mid = 0; 1058 } 1059 1060 for (i = 0; i < stream->outcnt; i++) 1061 stream->out[i].state = SCTP_STREAM_OPEN; 1062 1063 *evp = sctp_ulpevent_make_assoc_reset_event(asoc, flags, 1064 stsn, rtsn, GFP_ATOMIC); 1065 } else if (req->type == SCTP_PARAM_RESET_ADD_OUT_STREAMS) { 1066 struct sctp_strreset_addstrm *addstrm; 1067 __u16 number; 1068 1069 addstrm = (struct sctp_strreset_addstrm *)req; 1070 nums = ntohs(addstrm->number_of_streams); 1071 number = stream->outcnt - nums; 1072 1073 if (result == SCTP_STRRESET_PERFORMED) 1074 for (i = number; i < stream->outcnt; i++) 1075 stream->out[i].state = SCTP_STREAM_OPEN; 1076 else 1077 stream->outcnt = number; 1078 1079 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags, 1080 0, nums, GFP_ATOMIC); 1081 } else if (req->type == SCTP_PARAM_RESET_ADD_IN_STREAMS) { 1082 struct sctp_strreset_addstrm *addstrm; 1083 1084 /* if the result is performed, it's impossible for addstrm in 1085 * request. 1086 */ 1087 if (result == SCTP_STRRESET_PERFORMED) 1088 return NULL; 1089 1090 addstrm = (struct sctp_strreset_addstrm *)req; 1091 nums = ntohs(addstrm->number_of_streams); 1092 1093 *evp = sctp_ulpevent_make_stream_change_event(asoc, flags, 1094 nums, 0, GFP_ATOMIC); 1095 } 1096 1097 asoc->strreset_outstanding--; 1098 asoc->strreset_outseq++; 1099 1100 /* remove everything for this reconf request */ 1101 if (!asoc->strreset_outstanding) { 1102 t = asoc->strreset_chunk->transport; 1103 if (del_timer(&t->reconf_timer)) 1104 sctp_transport_put(t); 1105 1106 sctp_chunk_put(asoc->strreset_chunk); 1107 asoc->strreset_chunk = NULL; 1108 } 1109 1110 return NULL; 1111 } 1112